+JMJ+
Not only is Our Lady without sin, but she is also of entire purity of mind. This is in the full sense of the meaning of the word as well. Both her intellect and imagination were always set to the light of reason and Divine Law. Therefore, she is without any vice and her will always remained perfectly ordered to God. This is why she is the "Seat of Wisdom", because she has a special insight into the higher realities in every situation.
And while the old Eve presented a forbidden fruit to Adam, the New Eve presents the Divine Fruit of her sacred womb.
